Pounds to stone converter

How to convert pounds to stone

Divide the pounds by 14: st = lb ÷ 14. So 154 lb = 11 st, 168 lb = 12 st and 100 lb is about 7.14 st. Stone is still widely used for body weight in the UK and Ireland, where it is usually written as stones plus pounds, such as 11 st 5 lb.

Pounds to stones and pounds

To get stones and pounds, divide by 14: the whole number is the stones and the remainder is the pounds.

• 100 lb: 7 × 14 = 98, remainder 2, so 7 st 2 lb
• 159 lb: 11 × 14 = 154, remainder 5, so 11 st 5 lb
• 200 lb: 14 × 14 = 196, remainder 4, so 14 st 4 lb

In your head, halve the pounds and then divide by 7: 182 lb → 91 → 13 st.

Is 11.5 stone 11 st 5 lb?

No. 11.5 st means eleven and a half stone, which is 11 st 7 lb. To turn the decimal part into pounds, multiply it by 14: 0.5 × 14 = 7 lb.

Round only at the end. 100 lb is 7 st plus 2/14 of a stone, which is 2 lb; rounding first to 7.1 st and multiplying 0.1 by 14 gives 1.4 lb instead.

Pounds to stone chart

The stone values are rounded to six decimal places. The digits after the point are fractions of a stone, not pounds.

Why a stone is 14 pounds

Gibraltar's Weight and Measures Act, Schedule 1, Part V defines the stone as 14 pounds and the pound as exactly 0.45359237 kg. A stone is therefore exactly 6.35029318 kg.

Common mistakes

• Dividing by 16 or 10. Ounces go 16 to the pound, but pounds go 14 to the stone: 154 lb is 11 st, not 9.6 or 15.4.
• Leaving ounces in the pound figure. 140 lb 8 oz is 140.5 lb, or about 10.04 st (10 st 0.5 lb). Type it as 140+8/16 to convert it in one step.
• Converting kilograms as pounds. A reading in kg needs the kg to stone converter instead.

Related conversions

For the reverse step, use stone to pounds. The BMI calculator accepts weight in stone or pounds directly.